Decode multiple video/audio files (DASH's adaption sets)

[Jan Schmidt]

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On 05/11/15 13:33, Majaja wrote:
> Dear all:
> 
> I had a problm about DASH (in fact, even local file playback & if
> the file has multiple video or audio tracks) and would like to ask
> for your help.
> 
> The problem is, for my application, I have an unique Video/Audio
> decoder HW instance and they both DONOT support multi-thread usage.
> So they can only decode a sinle stream at one time. Once we create
> multiple instances for, ex video. It will lead to system crash.

As Duncan suggested, using the autoplug-select signal of decodebin,
you can control which decoder it uses and ensure only 1 stream gets
access to the hardware decoder.

Alternatively, it's possible to set it up as a hardware decoder sink
in playbin with a custom bin that uses one instance of the decoder,
and switches when caps change (you can use the autoconvert plugin for
that).

Or finally, we're working on decodebin3 which only instantiates a
decoder for actively decoded streams and switches streams into
decoders dynamically, which will fix the problem at the designed-in
level, but decodebin3 isn't ready for external testing just yet.

Regards,
Jan.

> 
> Please refer to the following link: 
> http://marea.tilab.com:8085/content/dash/clear/multiaudio/2audio/c1/al
l.mpd
>
>  The graph dump for this URL is as the link below. 
> https://bug756794.bugzilla-attachments.gnome.org/attachment.cgi?id=313
633
>
>  You can find that there are two audio adaption sets there, one for
> English and the other for Italian.
> 
> It makes playback fail here as the description above.
> 
> If we use software CODEC which supports multiple decoding threads,
> I think it will be O.K.
> 
> I believe there may be somebody who has the same problem with me,
> since for embedeed system applicaiton, it is a comman case to allow
> decode an unique stream only at a time.
> 
> DO you have any suggestion for this issue or has thers had an
> existing solution already?
> 
> Thank you
> 
> 
> 
> -- View this message in context:
> http://gstreamer-devel.966125.n4.nabble.com/Decode-multiple-video-audi
o-files-DASH-s-adaption-sets-tp4674394.html
>
> 
Sent from the GStreamer-devel mailing list archive at Nabble.com.
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> mailing list gstreamer-devel at lists.freedesktop.org 
> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
> 
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